catalogue of astronomical and surveying instruments
TRANSCRIPT
£U^
QB 86
• F3
Copy 1
CATALOGUEOF
f Astronomical and Surveying
INSTRUMENTS
MANUFACTURED BY
Fauth &. Co.,
No. 59 B Street, Corner of First, S. W.
FEOHTIHG CAPITOL PAEK,
WASHINGTON, D. C.
GIBSON BROTHERS, PRINTERS, WASH -^-ON.
CATALOGUEOF
Astronomical and Surveying
INSTRUMENTS
MANUFACTURED BY
FA.TJTH & Co.,
No. 59 B Street, Corner of Firg$jfc$k
FB0HTIN& OAPITOL PABK, \
WASHINGTON, D. C.
Entered, according to act of Congress, in the year 1883, by
FAUTH & CO.,
in the Office of the Librarian of Congress, at Washington.
X
CONTENTS.
PAGE.
Awards 7-8
Introduction 9
Reflectors 10
Equatorials 11
Portable Equatorials 14
Reconnoitring Draw Telescope, 15
Transit Circles, Fixed 16
Portable 18
Transits 19
DlPLEIDOSCOPES 21
Combined Transit and Zenith Instrument 22
The Coast Survey Prismatic Transit 24
Zenith Instrument 26
Chronograph 28
Astronomical Clock 30
Spherometer 31
Altitude and Azimuth Instruments 32
Theodolites 34
Engineer's Transit 37
Solar Attachment 38
New Quick-Levelling Tripod 42
Reconnoissance and Mining Transit 43
Levelling Instruments 44'
" Instrument and Gradientor 45
Engineer's Y Level 46
Locke's Hand Level 47
Levelling-Rods, Chains, and Tapes 47
Plane Table 48
Three-Arm Protractor 49
iii
IV CONTEXTS.
PAGE.
Tide Gauge 49
Magswtomsfsb 50
Dep Cercee 51
Sextant 52
Aeteficiae Horizon 52
Prismatic Compass 53
Heliotropes , 53
Contact-Slede Apparatus 54
Spectrometer 57
Spectroscopes 58
Deffractiox Gratdtgs 59
Eye-Pieces am) Micrometers 60
international ||UfpiiWfy
PHILADELPHIA, 1876.
Hie United States Centennial Commissi'on has examinedthe report ofthe Judges, and accepted the following reasons,
and decreed an award in conformity therewith :
Philadelphia, December 14th. 1876.
REPORT ON AWARDS.
Product, ASTRONOMICAL AND SURVEYING INSTRUMENTS.
Exhibitor, FAUTH & CO., Washington, D. C, U. S.
The undersigned, having examined the productherein described, respectfully recommend the sameto the JJ. S. Centennial Commission for Award, forthe following reasons, vis. :
For excellence in design and construction of the
Instruments exhibited— consisting of an S-feetequatorial Telescope, completely mounted, with a6\-incli object glass, by A. Clark & Sons; an Alt-
Azimuth Instrument, with 12-inch horizontal circle
read by three, and 10-inch vertical circle, read bytwo micrometer-microscopes with radial illumina-tion, and provided with chambered levels of first-
class accuracy ; also a Transit-Theodolite, and alevelling Instrument of lesser size.
J. E. HILGARD,Signature of the Judge.
APPROVAL OF GROUP JUDGES.
E. LEVASSEUER, J. SCHIEDMEYER,F. A. P. BARNARD, JAMES C WATSON,JOSEPH HENRY, GEO. F. BRISTOW,P. F. KUPKA, ED. FAVRE PERRET.
J. true copy of the record. FRANCIS A. WALKER,[SEAL] Chief of the Bureau of Awat*ds.
Given by authority of the D. S. Centennial Commission.
A. T. GOSHORN,Director General.
J. L. CAMPBELL, J. R, HAWLEY,Secretary. President.
v
INTRODUCTION.
IN presenting a new illustrated Catalogue and Price-List, we take this
occasion of thanking our friends for past favors and to solicit a con-
tinuance of then patronage. Our constant aim is to improve our
instruments, increase their accuracy and simplicity, and make then use
pleasant and convenient.
This Catalogue contains only the more important of our manufactures,
instruments and apparatus that have been designed for special purposes
not being included. We do not wish to occupy space in printing testi-
monials : but for every instrument herein mentioned we refer to parties
using them, who will testify as to their worth.
The prices are put as low as good workmanship and the best of
materials will allow.
We use only the very best objectives, well corrected for chromatic and
spherical aberration.
Our graduations are always on solid silver, unless otherwise mentioned,
and we call special attention to the beauty and correctness of our
divisions.
Our level vials are all ground, and their sensibility is in accordance
with the use of the instrument for which they are intended. Our finest
levels, which are chambered for the regulation of the bubble in changes
of temperature, are ground to a radius from 900 to 1,200 feet, and are
filled with pure ether. The report of the judges of the Centennial
Exposition fully attests the excellence of our levels. Since then we have
made great improvements in their manufacture, and can refer to nume-
rous parties in different parts of the country as to their excellent
performance.
The weight of our instruments is carefully considered in connection
with their use. Those intended for purely astronomical or the higher
grades of geodetic work, while not of excessive weight, are yet so con-
structed as to insure perfect stability. Those the use of which neces-
sarily involves much transportation by hand are so constructed that,
while the weight is materially decreased, the strength required is
obtained by a judicious and careful distribution of the metal.
All portable instruments, with then accessories, are packed in neat
boxes, firmly and conveniently arranged, so they can be put in and taken
out without trouble.
Terms net cash.
Deposits will be required on orders from persons un-known to us.
REFLECTORS.
Lovers of the study of Astronomy who cannot afford the
necessarily great expense of a refractor will find much satis-
faction in the use of a reflector.
Having had numerous inquiries for this class of instru-
ments, we have arranged with Mr. I. A. Brashear to furnish
us with his deservedly-celebrated speculas and flats, which we
mount with or without clockwork, as purchasers may desire.
We shall shortly issue a price-list of reflectors, and merely
state in advance that a 6-inch one can be furnished for about
$200.00, ranging up to $800.00 for a 15-inch, completely
mounted on an equatorial stand without circles or clockwork.
FATJTH & CO., WASHINGTON, D. C. 13
Cuts Nos. 1 and 2 show two styles of Equatorials made by us.
No. 1 is intended to be mounted on a brick or stone pier, which is
especially to be recommended for Telescopes of large size. We have,
however, built several of them with iron piers. No. 1 is then like No. 2,
complete in itself, ready to be set up in the observatory.
We have added several important improvements to these instruments
:
The Telescope can be moved in R. A. without stopping the clock or
disengaging the worm. When moved sufficiently the clock acts again
with the regular rate, without previous clamping. If desired, an ad-
ditional R. A. circle is provided, driven by an auxiliary clock-work, which
is kept running. An index shows the R. A. of the point to which the
Telescope is then directed.
The rate of the driving-clock is readily changed from siderial to lunar.
Our Equatorials are constructed with the utmost exactness, and every
one is provided with the following accessories
:
Finder.—A number of micrometrical and astronomical eye-pieces
;
transit eye-pieces and sun-shades; improved position micrometer, with
parallactic eye-piece movement, fine movement for spider line, and rapid
movement for entire micrometer to traverse the field. The micrometer
head is divided on silver ; the whole revolutions are read off on a separate
dial, which, in our opinion, is the prettiest device for recording whole
turns. The position circle is divided on silver, reading by opposing
verniers and microscopes to minutes or hundredths of a degree. Clamps
and tangent-screws, or, if desired, rack and pinion movement.
Large Declination and Hour Circles, divided on silver, and reading
with two verniers and microscopes to five seconds of arc and single
seconds of time respectively. Coarse graduation, with pointer, for con-
venience in setting, is put on the edge.
Driving-Clock with conical pendulum connected with polar axis ; can
be thrown in and out of gear from eye-end of Telescope ; additional
tangent-screw motion in R. A. and Decl. by means of rods and handles.
Illuminating lamps attached to end of declination axis.
No. 1.—Equatorial Telescope, of 4-inch aperture, with six eye-
pieces, fitted up as above $975 00
" 2.—Same, without clock-work or micrometer * 700 00
" 3.— " 5-inch aperture 1,400 00
" 4.— " without clock-work and micrometer 1,100 00« 5._ « 6-inch aperture 1,800 00
" 6.— " without clock-work and micrometer 1,500 00« 7._ « 7-inch aperture 2,500 00
« 8.— " 8 " " 3,000 00- 9.— " 9 " " 4,000 00" 10.— " 10 " " 5,500 00
The prices of larger instruments may be had on application.
FAUTH & CO., WASHINGTON, D. C. 15
Astronomical Telescope, mounted equatorially on a strong tripod
stand, with or without circles and tangent-screw motion.
No. 11.—Equatorial Telescope, of 3-inch aperture, mounted as
above, with finder, silvered circles, tangent-screw
motion, sun-shade, terrestrial and astronomical eye-
pieces $300 00
No. 12.—Same, without circles or tangent-screw motion 220 00
No. 13.—Same, 4-inch aperture, like No. 11 400 00
No. 14.—Same, without circles, etc 320 00
^
KEC0NN0ITKING DBAW-TELESCOPE.These are very convenient to carry. The Telescope, which has a fine
objective of two inches aperture, closes up in a leather case about 12
inches long, with straps attached, and is easily fastened to the stand by
a circular clamp. The stand has a small divided circle for roughly
measuring angles. Stadia wires are inserted in the eye-piece for measur-
ing distances. The stand, when folded, forms a round staff of about
2 inches diameter.
No. 15.—Reconnoitring Draw-Telescope, 2-inch aperture, as de-
scribed above $80 00
Note.—If Heliotrope fixtures are desired, (see cut No. 62,) con-
sisting of two plate-glass mirrors and two sight-rings, it
increases the price 20 00
Clamp and screw attachment, to screw into a tree or post, extra. 7 50
The above Telescope, without the stand 30 00
FAUTH & CO., WASHINGTON, D. C. 17
No. 16.—Transit Circle, with Telescope of about 8 feet focal
length and 6 inches aperture. Circles three feet in diameter,
one divided into five-minute spaces, which are read off by
means of 4 micrometer-microscopes to single seconds. Themicroscope-holder is in the form of a pulley concentric with '
the circles, allowing the ready shifting of the microscopes
to any part of the graduation. The other circle serves as a
finder, and is provided with a coarse graduation. Clamp and
tangents by means of rods and handles. Illumination regu-
lated by means of a milled head near eye-end. The pivots are
about two inches in diameter, made of hardened steel or phos-
phor bronze. The level, of best quality, is read by means of
a mirror. K. A. and Decl. micrometer with parallactic eye-
piece motion. Iron piers coated with asbestos and covered
with mahogany; the cut shows it without this covering.
Six micrometer eye-pieces and one diagonal. Price $4,000 00
No. 17.—Same, without circles and microscopes; two 6-inch
setting circles with level alidades attached near the eye-
end 2,500 00
No. 18.—Same as No. 16 ; telescope 5 inches aperture ; circles
30 inches diameter ; 4 microscopes . 3,000 00
No. 19.—Same, without the large circles, but with two finders. 2,000 00
No. 20.—Transit Circle, with telescope of 4 inches aperture;
circles 24 inches diameter ; in other respects like No. 16. . . 2,400 00
No. 21.—Same, without the large circles, but with two finders. 1,900 00
Collimators, revolving in Y's, with sensitive level over tele-
scope ; micrometer eye-piece according to size of objective,
from $250.00 upwards.
The above prices include reversing apparatus and observing chair,
with arrangement to raise and lower the back.
Note.—These instruments can be mounted upon stone or brick
piers, which is, perhaps, the better plan.
When, hi 1877, we made the Princeton Meridian Circle, we guaranteed
the graduation to be within one second. A critical examination by Prof.
C. A. Young shows the graduation to be much better than that. Since
then we have improved our Dividing Engine to such an extent that we
guarantee our graduation to be within one quarter second.
B
18 FAUTH & CO., WASHINGTON, D. C
SMALLEE TRANSITS.
No. 22.
TRANSIT CIRCLE.
No. 22.—Transit Circle, of three inches aperture, and circles of
16 inches diameter. One of the circles is coarsely divided
on the edge, and serves as a finder. The other is divided into
5-minute spaces, read by two micrometer-microscopes to
single seconds. The micrometers can be transferred from one
pier to the other. Sensitive striding level, read by means of a
mirror. R. A. and Decl. micrometer, level over micrometer-
holder ; a level is attached to the telescope for measuring
differences of zenith distances. The reversing apparatus
allows the instrument to be reversed with the greatest ease.
The iron stand is provided with the necessary adjusting
FAUTH & CO., WASHINGTON, D. 0. 19
screws for moving in altitude and azimuth. The instrument
is complete in itself, ready to be put on pier, and is provided
with mercury basin, diagonal, direct and collimating eye-piece,
lamps, etc. Price $1,650 00
No. 23.—The same, with four-inch telescope 1,800 00
No. 24.
3-INCH TRANSIT.
20 FAUTH & CO., WASHINGTON, D. C.
No. 24.—Transit Instrument, of 3 inches aperture, about 3Jfeet focus. The axis carries two 12-inch circles, one reading
to 10 seconds, the other to minutes ; both are divided on
the edge. The fine circle carries the latitude level. The
striding level over the axis is read by means of a mirror.
The iron stand has the necessary adjustments for altitude
and azimuth. Reversing apparatus, mercurial basin, diag-
onal, direct and collimating eye-pieces, lamps, etc. Price. .$1,000 00
No. 25.—The same, with telescope of 3 inches aperture and
about 3^- feet focal length. 6-inch setting circle, with level
alidade on axis ; delicate striding level;glass micrometer
instead of spider lines ; direct and diagonal eye-piece, with
parallactic movement ; improved clamp. One of the Y's
can be moved in azimuth, the other in altitude, and there be
firmly clamped. Reversing apparatus, lamps, etc. ........ 790 00
No. 26.
FAUTH & CO., WASHINGTON, D. C. 21
Cut No. 26 represents a smaller Transit of 2J inches aperture,
and about 30 inches focus. The axis carries a 6-inch finding
circle, with level alidade ; the striding level is chambered and
reads to single seconds ; glass diaphragm ; direct and diagonal
eye-pieces, with sun-shades, lamps, etc. The instrument is
adjustable in altitude and azimuth, and is in all respects, ex-
cept in size, like the preceding ones. Price of this instru-
ment, without reversing apparatus $600 00
SMALL TRANSITS.Small Transits, suitable for watch and clock makers for taking time.
The stand is similar to the one shown on cut No. 26. The Y's have no
adjustment, and the telescope is without clamp or circle ; a good
striding level, prismatic eye-piece with sunshade and glass micrometer
are provided.
No. 27.—Transit, with telescope of 1\ inches aperture, 16 inches
focus $165 00
No. 28.—Same, with telescope of 1^ inches aperture 140 00
DIPLEID0SC0PES,These small instruments are excellent for the determination of
time ; the telescope is about 4 inches in length ; the stand is
provided with adjustments to get it into the meridian. Price. $35 00
22 FAUTH & CO., WASHINGTON, D. C.
PORTABLE INSTRUMENTS.All the following Field instruments are packed complete in boxes
andprovided toith the following accessories: Shade, screw-drivers, ad-
justing-pins, plumb-bob, reading-glass, and dust brush.
No. 29.
COMBINED TRANSIT AND ZENITH INSTRUMENT,
as devised by Prof. G. Davidson, U. S. C. & G. S.
FAUTII & CO., WASHINGTON, D. C. 23
No. 29.—The frame of this instrument consists of two parts,
the upper part with the uprights revolving upon the lower,
to which it can be firmly clamped if used as a Transit. Whenused as a Zenith instrument, the clamp-screws are removed
;
stops and tangent-screw motion for turning it exactly 180°
around are provided. Two verniers and scale are attached to
the upper and lower base. The telescope has a clear aperture
of 2J inches, and about 28 inches focal length. It is provided
with micrometric eye-piece; two setting circles, divided on
silver, and reading to minutes, attached to the telescope-tube
near the eye-end ; one of these carries the delicate zenith level,
which reads to single seconds and is chambered; in addition,
also, an ordinary finding level. The clamp is the latest im-
proved pattern, and need not be carried around with the tele-
scope when reversing. The pivots are of phosphor bronze,
and finished with the utmost care ; bearings are agate. The
illumination is effected through the pivots ; the striding level
is chambered, and reads to single seconds. A Eamsden eye-
piece, diagonal eye-piece, two illuminating and one reading
lamp, are provided. The stand folds and is packed in box
with the telescope. Price, complete $990 00
FAUTH & CO., WASHINGTON, D. C. #w25
This form of transit, suggested by Steinheil, designed by G. N. Sseg-
niuller, was made by us for the United States Coast Survey. It
is intended to be set up in the prime vertical, the telescope
pointing east and west. By the use of a prismatic objective, any
star passing the meridian will be reflected and seen in the field
when the instrument is set up correctly; by turning it in its bear-
ings it will sweep the meridian. The pivot-rings are of phosphor
bronze, and, to avoid flexure as much as possible, these rings are again
connected by a tube, so that the telescope body is really double. Byone of the three setting-screws the instrument is moved in azimuth. It
is provided with a reversing apparatus, which also carries the illumi-
nating lamp. The fine level over the telescope is held by a projection
from the reversing apparatus, which secures the great advantage, that
the level need not be taken off on reversing the instrument ; it remains
on whether observing in the zenith or horizon. The setting-circle is
attached behind the micrometric eye-piece with level alidade, divided on
silver, and reading to minutes. It also carries the latitude level, which
is chambered, and reads to single seconds. This instrument, being very
simple and portable, is especially adapted for work in a rough or moun-
tainous country.
No. 30.—Telescope of 2J inch clear aperture, packed complete
in box, with two eye-pieces, illuminating and reading lamp,
and all accessories $790 00
FAUTH & CO., WASHINGTON, I). C. 27
Above cut represents the form of Zenith Instrument as used in the U.
S. C. & G. Survey and the U. S. Corps of Engineers. The telescope
swings on a horizontal axis, which is fastened to a vertical axis, and can
therefore be moved into any position. It is especially adapted for the de-
termination of differences of zenith distances. The horizontal circle is
provided with two stops, in order to bring the telescope into the meridian.
The telescope carries a circle with the latitude level and is provided with
a micrometer eye-piece. We make several sizes of these instruments.
No. 31.—Zenith Instrument, of 2 inches aperture, about 28
inches focal length ; 10-inch horizontal circle ; striding level
over horizontal axis ; fine latitude level attached to circle
;
micrometer eye-piece;packed complete $700 00
No. 32.—Zenith Instrument, as above, with telescope of 1^inches aperture 350 00
FAUTH & CO., WASHINGTON, D. C. 21)
Cut No. 33 represents our style of Chronograph, which, for com-
pactness and regularity of action, cannot be surpassed. It is
noiseless in its action, and the governor regulates the speed so
perfectly that the second marks form a perfect straight line.
The cylinder is 14 inches long and 7 in diameter, and runs
about 2 1- hours, with three feet fall and a weight of about
18 lbs. Sffigmuller's maintaining power, however, allows
the winding up without affecting the rate. The clock-
work is strong enough to drive 3 or 4 cylinders, which can
readily be attached. By pushing a button the speed of the
cylinder is doubled, which is very convenient in exchanging
clock-signals in longitude work. Price $350 00
Each additional cylinder, with frame, carriage-slide, and magnet 150 00
Chronograph paper for the above, per 100 sheets 1 50
FAUTH c* CO., WASHINGTON, D. C. 31
No. 34.—Astronomical Clock, with either Dennison's gravity or
dead beat escapement with jewelled pallets. The pendulum
is compensated and weighs about 40 lbs. We use Prof. C. A.
Young's break circuit attachment, which gives no spark, thus
saving the contact points from oxydation. Price $450 00
No. 35
SPIROMETER,as devised by Prof. Wm. Harkness, U. S. N,
A beautiful and exceedingly accurate instrument for measuring
the inequality of pivots ; much more reliable and expeditious
than the contact level. As made by us, it will measure pivots
from 2\ inches down to the smallest size. The round glass disc
on which the three legs rest is perfectly flat ; the screw is made
with the utmost exactness, bearing on a jewelled centre, and
the nut is so constructed that there can be no dead motion.
Price, in box $50 00
32 FAUTH & CO., WASHINGTON, D. C.
INSTRUMENTS FOR MEASURING HORIZONTAL AND VERTICAL ANGLES.
From Gebbie &Barrie's "Masterpieces of the U. S. International Exhibition, 187b.
No. 36.
ALTITUDE AND AZIMUTH INSTRUMENT.
FAVTI1 & CO., WASHINGTON, D. C. ?>3
ALTITUDE AND AZIMUTH INSTEUMENTS.Cut No. 36 represents one of our instruments, which was on exhibition
in the International Exhibition at Philadelphia, for which we received
an award.
It is of superior construction, and differs from other instruments of
this class in many important particulars. Not being a " repeating in-
strument," strictly speaking, and, therefore, not liable to the defects
inherent to repeaters, yet both the horizontal and vertical circles can be
shifted for position, so as to bring a different part of the graduation
under the microscopes. The circles are divided on silver into five-minute
spaces, reading by micrometer microscopes to single seconds. The
standards radiate out from the centre, and are high enough to let the
telescope swing through. The pivots of the telescope axis rest on agate,
and are made of phosphor bronze ; a delicate striding level, reading to
seconds, over the pivots, is provided ; illumination through pivots ; the
horizontality of the microscopes for vertical circle is controlled by a
chambered level, reading to seconds.
Both circles are entirely free of clamps and tangent-screws, these being-
attached to a collar, so as not to produce any strain.
No. 36.—Altitude-Azimuth, as described above; horizontal
circle eighteen, vertical circle twelve inches in diameter;
former reading by three, and latter by two microscopes
;
telescope 3-inch clear aperture, 28 inches focal length, with
micrometric eye-piece ; levels are chambered, and read to
seconds;packed complete in two boxes, with positive and
diagonal eye-piece, two lamps, and all accessories $2,000 00
No. 37.—Same, without vertical circle, and standards only high
enough for observation of polaris 1,200 00
No. 38.—Same as No. 36, and exactly like cut ; horizontal circle
twelve, vertical circle ten inches in diameter ; former reading
by three, latter by two microscopes. Telescope 2J-inch
clear aperture, 24-inch focus;packed complete 1,300 00
No. 39.—Same, without vertical circle ; standards as in No.
37 ; telescope 2-inch aperture;packed complete 800 00
No. 40.—Same as No. 39 ; circle reading by two instead of
three microscopes 700 00
No. 41.—Same as No. 36, and shown on cut ; horizontal circle
ten, vertical circle seven inches in diameter ; former reading
by three microscopes to seconds, the latter, by means of
level alidade, to ten seconds. Telescope swinging through
2 inches aperture, and about 18 inches focal length;packed
complete 850 00
c
34 FAUTH & CO., WASHINGTON, D. G.
No. 42.—Same, but without the vertical circle ; telescope not
swinging through : packed complete 650 00
No. 43.—Same as No 42 ; the circle reading by two instead of
three microscopes 550 00
No. 44.
IO-INCH THEODOLITE.
Cut No. 44 represents a Theodolite, of which we have made a
great number. It is especially adapted for purposes of in-
struction, and is in every respect a first-class instrument. The
circle—which shifts for position—is read by two micrometer-
microscopes, and also two verniers ; the telescope has an aper-
ture of If inches and about 16 inches focus ; improved clamp,
sensitive striding level, and field illumination for azimuth ob-
servations. Packed complete $550 00
FAUTH & CO., WASHINGTON, 1). C.
THEODOLITES.
35
No. 45.
10-INCH REPEATING THEODOLITE.
No. 45.—This cut represents a 10-inch Repeating Theodolite,
as made by us for the U. S. C. & Geodetic Survey. Circle is
10 inches diameter, reading by two verniers and microscopes
to 5 or 10 seconds. The telescope is of If inches aperture
and about 16 inches focus ; improved clamps and tangent-
screws ; sensitive level over telescope, and field illumination
for azimuth observations. Packed complete $450 00
In cut 45 the verniers are read off by means of a prismatic arrange-
ment, the instrument having been designed for a particular purpose.
The above price does not include this nor the eye-piece micrometer.
No. 46.—Eight-inch Repeating Theodolite, like No. 45. Twoverniers reading to 5 or 10 seconds ; telescope 1^-inch aper-
ture and 15 inches focus, with delicate striding level. Packed
complete $375 00
36 FAUTII & CO., WASHINGTON, D. C.
Note. If any of the above instruments are to read to 5 seconds
instead of 10, the cost will be $25.00 additional. The circles can also
be provided with cover at an increase of $10.00.
Strong double-leg tripods for any of the above instruments $15 00
WlllllllB
No. 47.
8-INCH THEODOLITE.
FAUTI1 & GO., WASHINGTON, D. C. 37
No. 47.—Kepresents an 8-inch Theodolite, of which quite a num-
ber have been made by us for the U. S. C. & G. Survey. The
circle, which shifts for position, is 8 inches diameter, divided
into 10-minute spaces, and is read by means of two micrometer-
microscopes. The telescope l^as an aperture of If inches and
about 18 inches focus. Improved clamp, sensitive striding
level, and field illumination. Price, with stand $425 00
No. 48.
ENGINEER'S TRANSIT.
38 FAUTH & CO., WASHINGTON, D. 0.
The preceding cut represents one of our complete high-grade Engineer
Transits. It differs from those of the ordinary construction in its great
lightness and strength, by judicious ribbing and bracing and the use of
hard metal. The standards are not of the common construction, but are
cast in one piece on a ring fitting tightly around the compass ring.
Each Y has three legs, the two outer ones being curved so as to stand
well in towards the centre of the plate, while the middle one is directly
under the bearing. By thus casting a great many parts in the whole,
which are usually made in pieces and screwed together, the instrument,
while it is very much stronger, stays also better in adjustment. Thecentres are long, compound, and of hard metal ; the graduation is on
solid silver ; the telescope is balanced in axis and reverses at both ends ;
shows objects erect unless otherwise ordered ; it is perfectly achromatic,
defines sharply, and magnifies 22 diameters ; the tangent-screws are
made of German silver and work with a beautiful smooth motion, with-
out any dead play ; compass needle 5 inches long, swinging on jewelled
centre. Ground levels.
No. 48.—Transit, as shown in cut. Circles 6J inches diameter,
divided on silver, reading by two verniers to 30 seconds ; ivory
shades to throw light on the verniers. The compass plate
reaches over and forms a cover for the circle ; the vertical
circle is read to minutes. Telescope reverses at both ends,
has an aperture of 1J inches with either terrestial or astro-
nomical eye-piece ; the compass needle is 5 inches long ; sen-
sitive level on telescope ; Stadia lines for distance measure-
ments ; centring arrangement for bringing instrument over a
given point ; adjustable plumb-bob. The instrument com-
pletely packed, with tripod $275 00
Note.—The above instrument we also make with three instead
of four levelling screws, double verniers on vertical circle,
striding level over telescope axis, and horizontal circle reading
to 10 seconds ; field illumination. Price $350 00
S0LAE ATTACHMENT.We take pleasure in bringing before the engineering profession a new
form of Solar Attachment, invented and patented by G. N. Saegmuller,
which is the simplest and most accurate ever devised. Attached to any
Engineer's Transit, the true meridian and deviation of the needle can be
obtained with far greater accuracy than with any solar attachment yet
invented.
40 FAIJTH & CO., WASHINGTON, D. C.
The foregoing cut represents the " Solar Attachment " fixed to anEngineer's Transit. It consists essentially of a small telescope and level,
the telescope being mounted in standards, in which it can be elevated
or depressed. The standard revolves around an axis, called the polar
axis, which is fastened to the telescope axis of the Transit Instrument.
The telescope, called the " solar telescope," can thus be moved in altitude
and azimuth. It is provided with shade-glasses to subdue the glare of
the sun, as well as a prism to observe with greater ease when the decli-
nation is far north. Two pointers attached to the telescope to approxi-
mately set the instrument are so adjusted that when the shadow of the
one is thrown on the other the sun will appear in the field of view.
Adjustment of the Apparatus.This is very simple, and requires less work even than to adjust the
common Transit.
First. Attach the "polar axis" to the main telescope axis in the
centre at right angles to the line of collimation. The base of this axis is
provided with three adjusting-screws for this purpose ; by means of the
level on the solar telescope this condition can be readily and accurately
tested.
Second. Point the transit telescope—which instrument we assume
to be in adjustment—exactly horizontal and bisect any distant object.
The transit level will then be in the middle of the scale. Point the
" solar telescope " also horizontally by observing the same object, and
adjust its level to read zero, for which purpose the usual adjusting-screws
are provided.
Directions for using the Attachment.First. Take the declination of the sun as given in the Nautical Al-
manac for the given da}T and hour, and correct it for refraction and
hourly change. Incline the transit telescope until this amount is indi-
cated by its vertical arc. If the declination of the sun is north, depress
it ; if south, elevate it. Without disturbing the position of the transit
telescope bring the solar telescope to a horizontal position by means of
its level. The two telescopes will now form an angle which equals the
amount of the declination.
Second. Without disturbing the relative positions of the two tele-
scopes, incline them and set the vernier to the latitude of the place.
The vertical axis of the "solar attachment" will then point to the
pole, the apparatus being in fact a small Equatorial.
By moving the transit and the " solar attachment " around their re-
spective vertical axis, the image of the sun will be brought into the field
of the solar telescope, and after accurately bisecting it the transit tele-
scope must be in the meridian, and the compass-needle indicates its
deviation at that place.
FATJTH & CO., WASHINGTON, D. C. 41
Advantages of the " Solar Attachment" over the Old Form.
First. It is more accurate.
Second. It is simpler and easier of adjustment.
Third. It is much cheaper.
It is superior to all forms hitherto used as the transit is to the ordinary
compass, or as a telescope is to common sights. For the ordinary sur-
veyor's compass the degree of accuracy of the old attachment will answer,
although even on a compass our k' solar attachment " would be an im-
provement.
When angles are laid off with a transit, however, it is certainly going
back a step to attempt to establish a meridian with a less precise instru-
ment, or one that has less pointing power.
The sights of an ordinary solar compass consist merely of a small lens
and a piece of silver with lines ruled on it placed in its focus. This is
simply a very primitive telescope, since the exact coincidence of the sunsimage with the lines has to be determined by the unaided eye, or at best
with a simple magnifying glass.
That far greater precision can be attained by means of a suitable
telescope is apparent ; in fact, the power of the solar telescope is in
keeping with the transit telescope, as it should be.
A glance at the cut will show that the " solar attachment " is far simpler
than the ordinary form. By raising or depressing, it can be set to north
or south declination. To effect this with the ordinary solar compass
two sets of primitive telescopes—one answering for north, the other for
south declination—are provided, which are difficult to adjust.
The addition of the level on the solar telescope dispenses with the
declination arc altogether, the arc or circle on the transit also serving
for that purpose in conjunction with it.
This " solar attachment " is in fact the only one which should be used
in connection with a Transit Instrument. It solves the solar problem,
s has been attested by the leading astronomers and engineers who have
seen and used it.
Price of Solar Attachment, complete, with sun-shades $40 00
Rectangular Prism to attach to eye-piece 5 50
42 FAUTH & CO., WASHINGTON, D. 0.
NEW QUICK-LEVELLING TKIPOD-HEAD, WITHSHIFTING-PLATE.
Patented by G. N. Sjegmuller, Washington, D. C.
No. 50.
The engravings represent a new form of Quick-Levelling Tripod, which
is the simplest and most convenient yet devised. It consists of two
circular discs, which are wedge-shaped—that is, thicker on one side than
the other. They are interposed between the levelling-screws and tripod-
head proper. By turning one or the other of them around their com-
mon centre the instrument can gradually be brought to a vertical posi-
tion. The final levelling touches are given by means of the usual levelling-
screws, which at the same time clamp the instrument firmly. The great
advantage of this Quick-Levelling Tripod over other forms is that the
instrument will not fall over even if it is not clamped, and no accident
on this account can occur.
It can be attached to any transit or leveling instrument.
Price $10 00
If ordered with a new instrument 7 50
FAUTII & CO., WASHINGTON, D. C. 43
No. 51.
RECONNOISSANCE AND MINING TRANSIT.
This cut represents a complete Transit Theodolite, which is especially
adapted for reconnoitring purposes, as it only weighs about 5 lbs.
Horizontal and vertical circles are 4 inches diameter, graduated on silver,
and both reading by opposing verniers to single minutes. The telescope
has an aperture of 1J inches and magnifies about 20 diameter.
Price, completely packed, with stand $200 00
EXTRAS FOR MINING TRANSITS.
Diagonal eye-piece, with adapter $20 00
Illumination for telescope 10 00
Brass lamp 8 50
Plummet lamp, in gimbals, per pair 25 00
44 FATJTH & CO., WASHINGTON, D. C.
LEVELLING INSTRUMENTS.
No. 52.
No. 52.—Level of Precision, as made by us for U. S. C. & G.
Survey, for the most exact work, can also be used as a gradi-
entor, the micrometer screw for raising or depressing the
telescope being made with the utmost exactness, and being
provided with a graduated head. The telescope has an
aperture of 1^ inches, and 16 inches focus, with two astro-
nomical eye-pieces, magnifying 40 and 60 times respectively.
The pivot-rings are of phosphor bronze,and rest on agate.
The striding level is chambered, and one division equals
3 seconds of arc. The horizontal circle, of five inches
diameter, divided on silver, reads to 30 seconds ; the centre
is of steel ; clamp and spring tangent motion. Completely
packed, with tripod $250 00
FAUTH & CO., WASHINGTON, I>. C. 45
LEVELLING INSTRUMENT AND GRADIENTOR.
H.H.NIDHQLS.SO.
No. 53.
No. 53.—Telescope 1J inch aperture, 10 inches focal length
;
4-inch horizontal circle, vertical arc, both divided on silver
and reading to minutes. By means of the gradientor attach-
ment, angles of depression or elevation can be measured with
great precision, as well as distances taken. The compass
needle is 5 inches long, in oblong box under the striding-level
;
this latter is ground and very sensitive. Packed complete in
box, with all accessories, tripod stand $225 00
FAUTH & CO., WASHINGTON, D. C. 47
The above cut represents a Y level of the most approved form. The
telescope has an aperture of 1J inches, and is about 16 inches long. It
rests in the Ys on hard bell metal rings ; the level bubble is very sensi-
tive ; centre long and compound ; four levelling screws.
Price, packed complete $145 00
Locke's Hand Level, in case, German silver $12 00
". " " brass 10 00
LEVELLING E0DS AND CHAINS.
Philadelphia Levelling Kod $18 00
New York " " 16 00
Boston " " 16 00
Grumman's Patent Chain, W. G. 18, with spring, level, thermom-
eter, brass handles ; weight J lbs., 50 feet 17 00
Land Chains, W. G. 8, brass handles, 50 feet 3 50
Same, 100 feet 5 50
" W. G. 12, 100 feet, bronzed links 11 50
Chains in feet or meters to any length ; compared with the U. S.
Standard.
STEEL TAPES.
Steel Tapes, in leather case,-J
inch wide, divided in l-10ths or
l-12ths and links or metres, 100 feet $16 00
50 feet 8 50
Pocket Tape, in nickel case, divided in l-10ths or l-12ths and
meters, 25 feet - 6 00
48 FAUTH & CO., WASHINGTON, D. G.
PLANE TABLE.
No. 55. The above cut represents one of our Plane Tables with
a portion of the board cut out to show the motion-work. The
most simple and effective form of plane-table made. The
bearing surface of the motion-work being 8 inches in diameter,
the table, when clamped, is perfectly firm. The alidade rule
is 20 inches in length, and carries a powerful telescope of 1^
FAUTH <fe CO., WASHINGTON, D. C. 41)
inches aperture, and 15 inches focus. For easier adjustment
of collhnation the telescope can be turned in its axis 180°
without lifting it out of its bearings. The compass-box is
detachable : needle 5 inches long ; striding level reading to
minutes. Stadia lines for measuring distances, beside the
ordinary cross-line, are ruled on glass diaphragm. The ver-
tical arc reads to minutes. The board is 24 by 30 inches, and
is provided with an extra packing-box The alidade packs in
a box with a number of paper clamps, beside the usual acces-
sories ; the motion work is also securely packed in a box.
Price, complete, with firm tripod stand $300 00
THREE-ARM PROTRACTORS.Protractors, as made by us for the U. S. Coast & Geodetic Sur-
vey, with 6-inch circle, divided on silver, and reading to
minutes ; the arms have extension-pieces to make them 30
inches long ; glass centre with pricking-hole. Complete, in
box $110 00
TIDE GAUGES.
Self-registering Tide Gauges, much improved, have been constructed
by us for the U. S. Coast Survey and the U. S. Engineers.
The roller system runs in a metal frame ; the large wheel is also
of metal, and the clock is of superior construction with spring
balance. Price $350 00
FAITH & CO., WASHINGTON, D. C. 51
No. 56.—Magnetometer, as made by us for the United States
Coast and Geodetic Survey. The magnet-box and small tele-
scope, by which the scale of the intensity-magnet is read off,
is detachable from the vernier-plate, and the standards, with
the telescope of 1^-inch aperture and 7 inches focus, can be
substituted ; it then forms a complete small Alt-Azimuth, large
enough to get, with sufficient accuracy in magnetic work, time,
azimuth and latitude. The circles are four inches in diameter,
divided on silver, and reading by two opposing verniers to
minutes. The telescope has prismatic eye-piece and sun-shade.
The deflecting bar is of wood, four feet in length, in two
pieces, so as to be easier to carry. It is divided to tenths of
inches. The intensity-magnets have at one end a fine divided
scale, (one division being equal to 5 minutes,) at the other end
the collimating lens ; the scale is viewed through the small
telescope of f-inch aperture and 3 inches focus ; tenths of
divisions can easily be estimated. Rack and pinion move-
ment in the glass tube to raise and lower the stirrup carrying
the magnet. A riding piece fits on the deflecting bar, upon
which the deflecting magnet is placed ; inertia-ring, twist-piece,
beside all the usual accessories, go with the instrument. Price,
complete, as shown on cut, packed in box, with tripod $400 00
No. 57.—Magnetometer, as made by us for U. S. Corps of
Engineers, with only one telescope, used both for determining
the magnetic and astronomical meridian. The magnet-box is
detachable from the vernier plate, and telescope can then be
used to observe for time or azimuth. Two collimating
magnets, deflecting bar, and all accessories go with it. Price,
completely packed, with tripod 250 00
DIP CIRCLE.
No. 58.—Dip Circle, with two 3|-inch needles, swinging on agate
and enclosed in glass case. Vertical circle 6 inches diameter,
divided on silver, reading by two opposing verniers to minutes.
Attached to the vernier arms are two reading microscopes to
read off the magnets. The lower horizontal circle is also 6
inches in diameter, and reads to minutes. Packed complete in
one box, with two large steel magnets and needle-holder for
convenience in magnetizing the needles, with all the usual
accessories 300 00
52 FAUTH & CO., WASHINGTON, D. C.
SEXTANT
No. 59.
The above cut represents our style of Sextant, which, although very
light, is an exceedingly accurate instrument.
No. 59.—Sextant of 7^ inches radius, divided on silver, and
reading to ten seconds ; the cut shows all accessories, packed
complete $110 00
ARTIFICIAL HORIZON.
No. (JO.—Artilicial Horizon, with mercury-bottle and trough,
rectangular plate-glass cover, packed in mahogany box $25 00
FAUTH & CO., WASHINGTON, I). C
POCKET COMPASS.
No. 61.
No. 61.—Prismatic Compass, 3 inches in diameter, with divided
ring on needle and folding sights;packed in neat case, very
convenient for reconnoissance $25 00
HELIOTROPES.
No. 62.
No. 62.—-As made by us for the United States Coast and Geodetic
Survey. The telescope body is an iron tube ; a wood screw
with joint is attached at the middle, so that the instrument can
be screwed to any tree or post. Mirrors of plate-glass. Price,
in box $30 00
No. 63.—Heliotrope, on tripod, with horizontal and vertical axis;
a graduated circle allows angles to be read off. Price, in box. 75 00
No. 64.—Pocket Heliotrope, Steinheils, a beautiful instrument
that requires no adjustment ; in case 20 00
FAUTII & CO., WASHINGTON, D. C. 55
Cut No. 64 represents a perfected form of the Contact-Slide Base
Apparatus, used in the C. & Gr. Survey., designed by Prof. J. E. Hilgard,
Sup't of that Survey. We have made several of this pattern for colleges
and Government Departments.
The apparatus consists of two measuring bars 4 meters long, exactly
alike, supported on trestles. The measurement is made by bringing
these bars successively in contact, which is effected by means of a screw
motion and denned by the coincidence of lines on the rod and contact
slide. Each bar consists of two pieces of wood about 8x14 c. m.
square and a little less than 4 meters long, firmly screwed together.
Between the pieces of wood is a brass frame carrying three rollers, on
the central one of which rests a steel rod about 8 m. m. in diameter.
On each side there is a zinc tube 9 m.m. diameter. The rod and tubes
are supported throughout then length on similar systems of rollers.
The zinc tubes form with the steel rod a metallic differential thermom-
eter, and are so arranged that one tube is secured to one end of the rod,
being free to expand in the other direction, the other tube being in a
like manner fastened to the other end of the rod. The zinc tubes, there-
fore, with any change of temperature, expand or contract in opposing
directions, and the amount by which the expansion of the zinc exceeds
that of the steel is measured by a fine scale attached to the rod, while
the zinc tube carries a corresponding vernier. The cut shows this
arrangement, which is identical on both ends of the bars ; a perforation
in the wood of the bar allows this scale to be read. In addition to these
metallic thermometers a mercurial thermometer is attached to the bar
about midway of its length.
The rods and tubes thus forming a united whole are lengthwise
movable on the rollers by means of a milled nut working in threads cut
on the steel rod, which passes through a circular opening in the brass
plate screwed to the wooden bar, and against which the nut presses.
Two strong spiral springs pull the rods back, and the nut is always
pressed against the plate.
One end of the rod is defined by a plain agate securely fastened to it
;
the other end carries the contact slide, having an agate with a horizontal
knife edge. This slide is a short tube, fitting over the end of the rod,
and pushed outward by a spiral spring. A slot in the tube shows an
index plate, with a ruled line fastened to the rod.
To align the bars properly a small telescope is placed on each bar,
and can be adjusted to bring the line of collimation over the axis of the
rod. The trestle, shown in the upper left hand corner of the illlustration,
consists of a strong tripod stand, carrying a frame with two upright
guides for two crow slides, which are separated by a movable wedge.
These cross slides can be clamped in any position. By moving the
wedge, the bar resting between the uprights is either elevated or de-
5() FAUTH & CO., WASHINGTON, D. C.
pressed. To obtain smooth movements, friction rollers are provided.
To move the bars sideways, a coarse screw takes hold of a projection on
the lower side of the bar ; by turning which, the bar can be movedlaterally.
There are three pairs of trestles, alike in construction with the excep-
tion that the upper slide of the trestle intended for the forward end of
the bar carries a roller on which the bar rests, while the other has a fixed
semi-cylindrical surface for the support of the bar. In making the
measurement, the bars being four meters in length, the stands are set
up at distances of two meters, each bar being supported at one-fourth
its length from the ends, as indicated by the painted black bands.
Each bar has a sector with level alidade attached to one side, by which
its inclination can be read off to single mmutes.
All base bars constructed by us are compared with U. S. standards.
Price of the whole apparatus, including two bars and six
trestles $450 00
Price of simple 4 meter Standard Bar 90 00
" of Abutting piece and Level Comparator to test bars 125 00
Note.—Bars of the same construction, in feet instead of meters, can
be furnished on order.
58 FAUTH & CO., WASHINGTON, D. C.
Cut No. 65 represents a very complete Spectrometer, according to the
plan of Prof. C. A. Young.
We have made several sizes of this instrument, with circles from 12
to 18 inches in diameter, and telescopes from 2 to 2-J inches aperture.
The circle is graduated into 5 minute spa ces and read by means of two
micrometer-microscopes to single seconds ; these microscopes are
attached to the arm carrying the observing telescope. The collimating
telescope can be turned on a separate axis by itself, and the whole in-
strument can be rotated on another axis. The grating table, which is
provided with all the necessary adjustments, turns on a centre of its
own and has attached to itself two verniers reading to five seconds on
the graduation of the circle. Both telescopes turn in adjustable Y's, for
which purpose a sensitive striding level is provided.
The price of these instruments varies, according to size,
from $600 to $1,200 00
No. 66.
SPECTROSCOPE,
FAUTH & CO., WASHINGTON, D. C. 59
The preceding cut represents the form of spectroscope as made by us.
It answers both for physical and astronomical research, and is arranged to
be used either with diffraction grating or prism. It consists of a circu-
lar box into which the collimator and observing telescope are screwed
The collimator slides in a tube so as to bring the slit into the focus of
the objective. This tube is connected with the adapter by four stiff rods,
leaving the slit easily accessible. The collimator tube is graduated into
millimetres. Grating or prism can readily be placed in the box on a
small table which has all the necessary adjustments. By means of a
milled head, projecting through the bottom of the box, the grating or
prism can be rapidly rotated. A slow motion can at once be obtained
without previous clamping by turning a tangent-screw fitted into the
periphery of the grating holder, which is held by friction to a plate to
which the projecting knob is fastened. The amount of rotation is meas-
ured to single minutes by a graduation on bottom of box. When the
grating is in use the collimator and view telescope are placed as shown
on cut, forming an angle of about 38 degrees. When the prism—which
is a dense flint—is to be used, the view telescope is changed and screwed
into a collar on the side of the box. The two telescopes are then placed
in a position of minimum deviation for the ultra-violet rays. The instru-
ment can be put into any position by means of an universal joint. It
is readily lifted off the stand when intended to be used with the telescope.
No. 66—Spectroscope as above, with telescopes of one inch
aperture, about 9 inches focus, extra dense flint glass prism.$200 00
No. 67—The same, with telescopes of 1^-inches aperture and 12
inches focus 250 00
No. 68—Spectroscopes on the above plan, of much simpler
construction, either for gratings or prisms , 75 00
No. 69—McLean's Star Spectroscopes, consisting of a cylindrical
concave lens in front of a direct vision prism 25 00
This Star Spectroscope can also be used with above spectroscopes byattaching it opposite the observing telescope and taking off the collima-
tor, making the instrument complete for stellar, solar, and physical work.
We are happy to state that we have made arrangements with Mr. I).
C. Chapman, who is well known as having been Mr. JRutherfurcT
s
assistant in the manufacture of diffraction gratings, to rule gratings
for us. A new engine, provided with all the improvements which his
familiarity vnth this hind of work suggested, is now being built by us.
60 FAUTH & CO., WASHINGTON, D. 0.
EYE-PIECES AND MICKOMETEES.
POSITIVE EYE-PIECES.
Ramsden—J inch to J inch equivalent, each $4 50
1 " H " " " 5 00
If " 2J" " " 6 00
Kellner (achromatic)—J inch to f inch equiv., each 6 00
I " " " 7 00
li " " " 8 50
II " " " 10 00
Steinheil (achromatic)—J inch to J in cl>. equiv., each ... 9 00
1 " " "..... 12 00
NEGATIVE EYE-PIECES.
Huyghens—J inch to 1 inch equiv., each $5 00
li " li " " " 6 00
Airy (giving a large and perfectly flat field)—J inch to ^ inch equiv.,
each 6 00
£ inch equiv., each 7 00
I " " " 9 00
li " " " 10 00
II " " " 12 00
" 16 00
TERRESTRIAL OR INVERTING EYE-PIECES FOR DIRECTVISION.
Fraunhofer—J inch to J inch equivalent, each $7 50
f " " " 8 00
I " " " 10 50
II " to 2 inches " " 15 00
Airy (large and perfectly flat field)—J inch to ^ inch equiv., each. 8 50
£ inch equiv., each 10 00
1 " " " 12 00
1J" to 2 inches equiv., each 16 00
DIAGONAL TERRESTRIAL EYE-PIECES.
1 inch to J inch equiv., each $18 00
1 " 11 " " " 20 00
REFLECTING PRISMS.First surface reflecting prism (solar) $15 00
§ inch square, mounted with sunshade 7 50l " " " " " 10 00
FAUTII & CO., WASHINGTON, D. C. 61
J inch square, mounted with sunshade 15 00
1 " " " " " 20 00
Helioscopic eye-piece, Merz, modified by Prof. Young, according to size,
from $50 up.
MICROMETERS.Eye-piece micrometer, (filar,) each $50 00
Reading " with achromatic objective 65 00
Position " according to style, from $75 up.
Double image " " " from $75 up.
Compensation Slides, of neutral tint glass, according to size, from $5 up.
LEVEL VIALS,
of all sizes and grades of sensitiveness, from $0.75 to $1.00 per inch.
Chambered Levels, reading to seconds, from $3 to $5 per inch.